Insulator



(No Model.)

F. B. GRIMM & J. H. NESSLER.

INSULATUR.

188880882. Patented Sept. 28,1897.

l/ J l FRED B, GRIMM AND JOHN H. NESSLER, OF QUINCY, lLLlNOlS.

INSULATOR.

SPECIFICATION forming part of Letters Patent No. 590,832, dated September 23, 1897.

Application filed January 4, 1897. Serial No. 617,940. (No model.)

To @ZZ wwm/ t may concern.'

Be it known that we, FRED B. GRIMM and JOHN Il. NEssLnR, citizens of the United States, residing at Quincy, in the county of Adams and State of Illinois, have invented a new and useful Insulator, of which the following is a specification.

This invention relates to insulators for use on poles in connection with telegraph, telephone, and electric-light wiring, and has for its special objectA the provision of means for tightlysecurin g the wire to the insulator without the use of the eXtra tie-wire which is commonly employed for this purpose.

The invention also contemplates an iniproved construction of insulator which insures a secure binding of the wire in place, while at t-he saine time obviating sharp kinking or straining of the wire, and also relieves the pin supporting the insulator from the side stress or strain which is an incident to the use of the side-tie wire usually employed for fastening the wire inthe groove of the insulator.

A further object of the invention is to so construct theinsulator as to provide a perfect drainage or shedding of water to lessen the waste of the electric currents and prevent corrosion of the wire.

lVith these and other object-s in view, which will readily appear as the nature of the in- 1 vention is better understood, the same consists in the novel construction, combination, and arrangement of parts hereinafter more fully described, illustrated, and claimed.

In the drawings, Figure l is a perspective view of an insulator constructed in accordance with this invention. Fig. 2 is a plan view thereof. Fig. 3 is a cross-sectional view of the insulator. Fig. 4 is a vertical sectional view on the line 4 4 of Fig. 2, the line of section following the siginoidal or ogee curvature of the wire-receiving groove. Fig. 5 is a vertical sectional view of the insulator.

Referring to the accompanying drawings, 1 designates the body of the insulator, which is preferably made of glass, but of course may be made of `any other suitable non-conducting material.

l is made in substantially the same shape as the insulators in common use and is provided in its lower end with the usual threaded socket The glass insulator-bodyv 2, which engages with the threaded pin of the cross-arm of the pole in the ordinary manner, such connection being the common way of fastening insulators on telegraph and similar poles. Y

In the present invention the upper end of the insulator-body 1 is indented with a deep Vertical transverse wire-receiving 0roove 3, which groove, while extending in a transverse direction across the insulator-body, has a sig-A moidal or ogee curvature to provide for bending lor kinking the wire sufiiciently to prevent it pulling or drawing out of place after having once been inserted and pressed downward within the groove. The deep vertical transversely-extendin g sigmoidal groove 3 is provided with opposite downwardly-convergent side walls 4, which converge in a direction toward the vertical center of the insulatorbody, so as to dispose the wire, which is inserted in the groove, as nearly as possible at the transverse vertical center of the body, whereby the cross-arm pin on which the insulator is fastened is relieved of the side stress or strain incident to the use of the usual extra side ties.

The downwardly-convergent side walls 4 of the wire-receiving groove 3 produce a groove that is V shape in vertical section to adapt the saine for receiving and gripping any gage of wire, and the vertex or base 4n of the groove declines in opposite directions toward the opposite sides of the insulator-body to provide a perfect drainage or shed for water that runs into the groove, and the said opposite downwardly-convergent side walls 4 of the wirereceiving grooves are provided with a plurality of upright channels 5, that serve to deliver the water freely into the bottom of the groove 3,whence it readilyescapes at the ends of the groove, which ends of the groove terminate at opposite sides of the'insulator-body in inclined slots 6.

The central portion of one of the walls 4 of the wire-receiving` groove is rounded, as at 7, and projects above the plane of the top edge of the opposite wall to forni a bearing-knob against which the wire can be pressed and bent to conform to the shape of the groove, and thereby facilitate the ready insertion of the line-wire into the groove, after which insertion the wire is forced downward, so as to IOO he wedged lirnily in plaee. To insure a seeuro binding of: the line-ivire in the groove, the ends ol sueh groove are more sharply Curved than the intermediate inajor portion of the groove, as clearly illustrated in Fig. 3 ol the drawings.

Frein the foregoing it is thought that the construction and use of the hereiwdeseribed insulator will be readily apparent, and at this` point it is 'to he further observed t-hat while the ordinary extra tie-wire is dispensed with, yet the line-Wire ean be quickly and readily attached to the insulator and also released therefrom.

Changes in the forni, proportion, and the ininor details oi' eonstruetion may be resorted to without departing from the principle or saerilieing an)v of the :ulvantages of this in vention.

Having thus described the inventioinwhat is elaiined7 and desired to he seen red hy Letters Patent, is

l. An insulator provided in its top with a transverse signioidal wire-receiving groove having downwardly-eonvergent side walls forined with a plurality of upright Channels, substantially as set forth.

An insulator provided in Vthe top thereof with a deep vertioal siginoidal wire-reeeiving groove having downwardly-eonvergenl side ivalls converging in a direetion toward the vertical Center olf the insulater-hotly, sulist antially as set t'orth.

An insulator provided in the top l'llereol' with a vertical transverse u'iro reeeiving groove having a siginoidal curvature and doivnwardly-eonvergent side Walls, the ver tex or hase oi' the 'grooves declining in oppo site directions toward the ends thereof7 subi stantiallyv as set forth.

,l. An insulator provided in the top thereof with a deep vertical siginoidal wire-reeoiving groove having downwardly-eonvergent side walls lorined with a pl urality of illn'iglit eilannels, the vertex ol the groove deelining in opposite directions, and the Central portieri ot` one of the Walls being rounded and projeeled above the plane ol the top edge ol` the opp site ivall, substantililly as set forth.

ln testimony that We elaiin the foregoing as our ovvn ive have hereto allixed our signatures in the presence of two witnesses.

'FRED 13. (lllllflilli. lOl IN ll. NQSSLlill-l.

lslitnesses:

Tues. Gon'DoN, CARL E. lVnnnn. 

